Delete row sig_1cdcf9ccbbe3 from signals

id sig_1cdcf9ccbbe3
event_id evt_9822394d3abf
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_a94e70b5b ...
dedupe_key signal_enriched:discovery_ipo_delta:6f245bc399f7a6 ...
throttle_s 0
created_at 2026-04-22T07:06:43.381459+00:00
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